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Tomatillos, which are closer botanically to the gooseberry than to the tomato, have a wonderful acidic tang. To get the best out of them they should be simmered or grilled for about 10 minutes, until they’re soft and the color has gone from pale green to olive. You can use them for a quick, blended salsa (like the one in this recipe) and also for a cooked salsa, which has a rounder, seared flavor. Use on tacos, or as chip or vegetable dip, or alongside grilled chicken or pork.